can I keep it up

I've been hanging out with this 22 year old since june or july. until recently, we saw each other once or twice a month. we'd get together and watch movies and work on little art projects. sometimes we'd get high and have sex. sometimes we'd go to bar. once we went to a sex store and she bought a couple toys for herself. I liked hanging out with her because she was so feminist, and queer, and cute. red hair, left-handed, pool-player, and she found me attractive.
I can't even talk about all the drama that has gone on in my friendship with her. There is too much, and the worst of it is too recent. I forgot how fucking annoying it is to be 22 and to react wildly to everything (and I am someone who has MANY reactions) and to basically be a fucking messy pain in the ass. Is that every 22 year old? I think it is.
Since she got a girlfriend, though, she doesn't talk to me about things anymore. I don't see her anymore. She stopped taking her bipolar meds a few weeks ago and has been more of a wreck than usual. With how weird she's been to me since she started dating her girlfriend, I'm beginning to think it's time to friend-dump her.
I can only take so much frustration before I cut off the thing that's rubbing me raw.
My loneliness has done strange things to me. I never would have hung out with someone so young before, but she was literally the only person I could find who even kind of fit my admittedly strict standards. I was desperate. Orlando FL is not the place for me.
She's away this weekend, and the silence has been good. I'm not assailing her with my unanswered texts or being confused by her ill-worded responses. I have begun to turn my mind from her and onto other things. I've stopped working on the painting I was making for her, of her dead cat playing the harp while garbed in angel wings and a halo. I have stopped mentally keeping movies aside to watch with her. I am releasing my expectations and all the things we talked about doing together. I am cleaning her from my mind. Sweeping out the piles of shit and discarded promises.
I've had to do this with friends before. But never ones I was sleeping with. I'll miss having the opportunity to learn bdsm from her, but there are other people and other ways.
She just isn't healthy for me anymore.